JP2011154715A - Bed load monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bed load monitoring system that is equipped with a load detector for a bed having a mounting board portion with a reduced height for mounting a leg portion of the bed. <P>SOLUTION: A load detector 1 includes: a base board portion 2; a mounting board portion 13 that is arranged at a tip portion of a cantilever portion 7 which is supported substantially horizontally apart upward from a bed installation face 55 in the base board portion 2 and on which a caster 51 as a leg portion of the bed is placed; and distortion detection sensors R1 to R4 which are attached to the cantilever portion 7, detect distortion of the cantilever portion 7 and output a signal used for detection of a load on a bed. A monitoring system includes: the load detector 1; a calculation means 21 that based on the output signals from the distortion detection sensors R1 to R4 of the load detector 1, calculates whether a subject is in the bed or not; a display means 25 that displays the calculation result of the calculation means 21; an alarm means 26 that based on the calculation result of the calculation means 21, releases an alarm; and a communication means 27 that transmits the calculation result of the calculation means 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bed load detector, a bed presence detection device that detects whether or not a subject is present on the bed, a bed presence detection method, and a bed presence monitoring system.

  In medical facilities, elderly facilities, nursing care facilities, etc., to stay on the bed (stay) for sleep, rest, etc. on the bed, for example, to understand the health of subjects such as sick people, infants, elderly people, care recipients, etc. A biological information measuring device for measuring biological information such as body motion, respiratory rate, and pulse rate (heart rate) of a subject has been developed.

  In addition, as a device for detecting whether or not the subject is on the bed, a load cell is attached to the leg of the bed, and the subject's presence / absence is detected based on the output signal from the load cell. Is known (for example, Patent Document 1).

  In addition, as a bed load detector interposed between the leg of the bed and the bed installation surface, a sensor board with a strain sensitive resistor mounted on the upper surface of the base is installed, and on the upper side of the bed, There is also known one in which a load receiving plate that receives a load on a leg and causes a strain-sensitive resistor to be distorted (for example, Patent Document 2).

JP 2003-79585 A JP 2000-105884 A

  By the way, the bed load detector is configured to detect the load of the bed by placing the leg portion of the bed on a predetermined placement portion provided in the load detector. According to the load detector, if the height of the placement portion is high, the height of the bed bed surface from the bed installation surface increases accordingly, so that it is difficult for the subject to stay on the bed or to leave the bed. In addition, there is a possibility that the work of placing the leg portion of the bed on the load detector or lowering it from the load detector becomes difficult.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a bed load detector in which the height of the mounting plate portion on which the leg portion of the bed is placed is kept low, and a bed including the same. It is to provide a bed occupancy detection method, a bed occupancy detection method using the load detector, and a bed occupancy monitoring system including the load detector.

  The present invention provides the following means.

[1] a substrate unit placed on the bed installation surface;
A mounting plate portion on which the leg portion of the bed is mounted, provided at a tip portion of a cantilever portion supported substantially horizontally in a state of being spaced upward from the bed installation surface on the substrate portion;
A strain detection sensor that detects a strain of the cantilever portion and outputs a signal used to detect a load of the bed;
A bed load detector characterized by comprising:

[2] The substrate portion includes a pair of side portions disposed to face each other at a distance from each other, and a connection side portion that is disposed between the both side portions and that connects one end portions of the both side portions to each other. Have
The bed load detector according to claim 1, wherein the cantilever portion is supported by the connecting side portion so that the placing plate portion can be displaced downward between the side portions.

[3] The substrate portion is disposed so as to be opposed to each other with a pair of side portions spaced apart from each other and between the both side portions so as to be opposed to each other. A pair of connecting sides connected to each other,
The cantilever part is supported on one of the connecting side parts so that the mounting plate part can be displaced downward between the both side parts and the connecting side parts. The bed load detector according to claim 1, wherein

[4] The bed leg comprises a bed moving caster,
The bed load detector according to claim 3, wherein a slope surface for guiding the caster from the bed installation surface to the placement plate portion is formed on the other connection side portion of the two connection sides.

  [5] The bed according to any one of items 1 to 4, wherein the placement plate portion is provided with leg portion fall prevention means for preventing the leg portion of the bed from falling from the placement plate portion. Load detector.

  [6] The above-mentioned item 5, wherein a rising edge leg-preventing wall portion is provided on the base end edge portion of the mounting plate portion as the leg portion falling prevention means with respect to the upper surface of the mounting plate portion. Bed load detector.

  [7] The item 5 described above, wherein a pair of leg-falling prevention wall portions rising from the upper surface of the mounting plate portion is provided on both side edges of the mounting plate portion as the leg falling prevention means. Or the load detector of the bed of 6.

[8] The leg of the bed comprises a bed moving caster,
On the front end edge of the upper surface of the mounting plate part, a convex strip that the caster can ride over is provided along the front end edge,
The bed load detector according to claim 7, wherein the caster is placed at a normal load detection position on the placing plate portion when the caster climbs over the ridge portion.

[9] As a means for preventing the caster from falling on the mounting plate portion at the base end edge portion of the mounting plate portion, a caster fall prevention wall standing up with respect to the upper surface of the mounting plate portion Part is provided,
As means for preventing the casters from falling from above the mounting plate portion on both side edges of the mounting plate portion, a pair of caster fall prevention wall portions rising from the upper surface of the mounting plate portion is provided. Provided,
On the front end edge of the upper surface of the mounting plate part, a convex strip that the caster can ride over is provided along the front end edge,
The caster is configured to be placed at a normal load detection position on the placement plate part by moving over the convex ridge part,
The front surface of the ridge is formed on an inclined surface having an upward slope larger than the slope of the slope surface in the traveling direction of the caster when the caster is placed on the mounting plate part from the bed installation surface. 5. The bed load detector according to item 4 above.

[10] The leg portion of the bed comprises a bed moving caster,
As means for preventing the casters from falling from above the mounting plate portion on both side edges of the mounting plate portion, a pair of caster fall prevention wall portions rising from the upper surface of the mounting plate portion is provided. The caster is provided in a state in which the distance between the two is increased in the direction opposite to the traveling direction of the caster when the caster is placed on the placement plate part from the bed installation surface.
At the base end edge portion of the mounting plate portion, there is a stopper wall portion standing up with respect to the upper surface of the mounting plate portion, which stops the caster that has reached the normal load detection position on the mounting plate portion. 4. The bed load detector according to item 3 above.

  [11] The bed load detection according to item 10 above, wherein a slope surface for guiding the caster from the bed installation surface to the mounting plate portion is formed on the other connection side portion of the two connection side portions. vessel.

[12] On the front end edge of the upper surface of the mounting plate part, a protruding strip is provided along the front end edge so that the caster can get over,
The bed load detector according to claim 10 or 11, wherein the caster is placed at a normal load detection position on the mounting plate portion when the caster rides over the protruding portion.

[13] On the front end edge of the upper surface of the mounting plate part, a protruding ridge that can be overcome by the caster is provided along the front end edge,
The caster is configured to be placed at a normal load detection position on the placement plate part by moving over the convex ridge part,
12. The bed load detector according to claim 11, wherein the front surface of the ridge is formed on a slope having an upward slope larger than the slope of the slope surface in the traveling direction of the caster.

  [14] In any one of the preceding items 1 to 13, wherein at least the distal end portion of the upper surface of the mounting plate portion is formed on a slope having a downward slope in a direction from the distal end edge portion to the proximal end side of the mounting plate portion. Bed load detector as described.

  [15] Any one of items 1 to 14 above, wherein at least a distal end portion of the lower surface of the mounting plate portion is formed on a slope having a downward slope in a direction from the distal end edge portion to the proximal end side of the mounting plate portion. The bed load detector as described in the item.

[16] In a recess provided on the floor contact surface with the bed installation surface, an elastic non-slip member is disposed so as to protrude below the floor contact surface,
Under the state of being placed on the bed installation surface,
When the leg portion of the bed is not placed on the placing plate portion, the floor contact surface is supported by the anti-slip member, and the floor contact surface is separated upward from the bed installation surface. While
When the leg portion of the bed is placed on the placement plate portion, the anti-slip member is compressed between the top surface of the recess and the bed installation surface by a load from the leg portion of the bed. The bed load detector according to any one of the preceding items 1 to 15, wherein the bed contact surface is configured to come into contact with the bed installation surface.

[17] The recesses are respectively provided at three or more locations surrounding the position immediately below the normal load detection position on the placing plate portion on the floor contact surface,
The bed load detector according to claim 16, wherein the anti-slip member is disposed in each of the recesses.

  [18] The size of the recess is set to a size that can accommodate the entire anti-slip member in a state in which the anti-slip member is compressed between the top surface of the recess and the bed installation surface. The bed load detector according to 16 or 17.

  [19] The bed load detector according to any one of items 16 to 18, wherein the anti-slip member is made of rubber.

  [20] The load detector for a bed according to any one of items 1 to 19, wherein a strain gauge is attached to the cantilever as the strain detection sensor.

  [21] The bed load detector according to [20], wherein an electrical output signal from a bridge circuit incorporating the strain gauge is used to detect a bed load.

  [22] The bed load detector according to any one of items 1 to 21, wherein at least one of the substrate portion, the cantilever portion, and the mounting plate portion is formed of an extruded material.

  [23] The bed load detector according to any one of items 1 to 21, wherein at least two of the substrate portion, the cantilever portion, and the mounting plate portion are integrally formed by aluminum die casting.

[24] The bed load detector according to any one of items 1 to 23,
Based on the output signal from the strain detection sensor of the load detector, calculating means for calculating whether the subject is on the bed,
A bed occupancy detection device comprising:

  [25] The bed occupancy detection apparatus according to [24], further including display means for displaying a calculation result of the calculation means.

  [26] The bed occupancy detection apparatus according to item 24 or 25, further comprising alarm means for issuing an alarm based on a calculation result of the calculation means.

  [27] The bed presence detection apparatus according to any one of items 24 to 26, further including a communication unit that transmits a calculation result obtained by the calculation unit.

  [28] The bed load detector according to any one of the preceding items 1 to 23 is placed on a bed installation surface, and a bed leg is placed on a placement plate portion of the load detector, In this state, a bed bed detection method comprising detecting whether or not a subject is on the bed using an output signal from a strain detection sensor of the load detector.

[29] The bed load detector according to any one of items 1 to 23,
Based on the output signal from the strain detection sensor of the load detector, calculating means for calculating whether the subject is on the bed,
Display means for displaying a calculation result of the calculation means;
Alarm means for issuing an alarm based on the calculation result of the calculation means;
Communication means for transmitting a calculation result of the calculation means;
A bed occupancy monitoring system characterized by comprising:

  The present invention has the following effects.

  In the invention of [1], a load detector having a simple configuration can be obtained, and the height of the mounting plate portion of the load detector can be kept low.

  In the invention [2], there is no substrate portion below the placement plate portion, and therefore the height of the placement plate portion can be set further lower.

  In the invention of [3], similarly to the invention of [2], there is no substrate portion below the placement plate portion, so that the height of the placement plate portion can be set further lower. it can.

  Furthermore, since one end part and the other end part of both side parts of the substrate part are connected to each other by a pair of connecting side parts, the stability of the substrate part is high, so that the mounting plate part is accurate. Will be displaced downward. Thereby, a load can be detected correctly.

  In the invention of [4], when the caster as the leg portion of the bed is placed on the placement plate portion from the bed installation surface, by passing the caster on the slope surface of the other connecting side portion, The caster can be easily placed on the placement plate portion.

  In the invention of [5], the fall of the leg portion of the bed from the placement plate portion can be prevented.

  In the invention of [6], the fall of the leg portion of the bed from the placement plate portion can be reliably prevented.

  In the invention of [7], the fall of the leg portion of the bed from the placement plate portion can be surely prevented.

  In the invention of [8], the caster as the leg portion of the bed can be reliably placed at the regular load detection position on the placement plate portion. Furthermore, about the caster mounted on the mounting board part, the accidental fall from the front-end | tip edge part of a mounting board part can be prevented by this protruding item | line part.

  In the invention of [9], it is possible to reliably prevent the caster as the leg portion of the bed from dropping from the placement plate portion. Furthermore, the caster can be reliably placed at a proper load detection position on the placement plate portion. Furthermore, about the caster mounted on the mounting board part, the accidental fall from the front-end | tip edge part of a mounting board part can be prevented by this protruding item | line part.

  Furthermore, since the front surface of the ridge is formed on an uphill slope that is larger than the slope of the slope surface in the running direction of the caster, whether or not the caster has climbed over the ridge from the slope surface, that is, the caster. The bed moving operator can easily determine whether or not is placed at a proper load detection position on the placement plate portion based on the magnitude of the force when pushing the bed.

  In the invention of [10], since the pair of caster fall prevention wall portions are provided at both side edges of the placement plate portion, the casters as the bed leg portions are placed on the placement plate portion from the bed installation surface. When placing, the caster can be prevented from dropping from the placement plate portion.

  Furthermore, both caster fall prevention walls are provided in a state in which the distance between them is wide in the direction opposite to the traveling direction of the casters. Therefore, when the caster is placed on the placing plate portion, the caster can be easily placed between the two caster fall prevention wall portions on the placing plate portion, thereby facilitating the placing work of the caster. It can be carried out.

  Furthermore, since a stopper wall portion is provided at the base end edge portion of the mounting plate portion to stop the caster from reaching the normal load detection position on the mounting plate portion, the caster is placed on the mounting plate portion. It can be securely placed at a normal load detection position.

  In the invention of [11], when the caster is placed on the placement plate portion from the bed placement surface, the caster is placed by running (passing) the slope surface of the other connecting side portion. It can be easily placed on the placing plate portion.

  In the invention of [12], the caster can be reliably placed at a regular load detection position on the placement plate portion. Furthermore, about the caster mounted on the mounting board part, the accidental fall from the front-end | tip edge part of a mounting board part can be prevented by this protruding item | line part.

  In the invention of [13], the caster can be reliably placed at a proper load detection position on the placement plate portion. Furthermore, about the caster mounted on the mounting board part, the accidental fall from the front-end | tip edge part of a mounting board part can be prevented by this protruding item | line part.

  Furthermore, the front surface of the ridge is formed on a slope having an upward slope that is larger than the slope of the slope surface in the traveling direction of the casters. Therefore, whether the caster gets over the ridge, that is, whether the caster is placed at the proper load detection position on the placement plate, the force when the bed moving operator pushes the bed is determined. It can be easily determined based on the size of.

  In the invention [14], it is possible to prevent the bed leg portion from falling from the front end edge portion of the mounting plate portion.

  In the invention of [15], the distance from the bed installation surface of the front edge of the mounting plate portion can be increased. Therefore, it is possible to prevent as much as possible the contact of the tip edge portion of the mounting plate portion with the bed installation surface due to the lowering of the mounting plate portion.

  In the invention of [16], when the load detector is placed on the bed installation surface and the leg portion of the bed is not placed on the placement plate portion, the load detector The floor contact surface is supported by a non-slip member, and the floor contact surface is configured to be spaced upward from the bed installation surface. Therefore, when the leg portion of the bed is placed on the placement plate portion, the load detector can be prevented from slipping on the bed installation surface by the anti-slip member.

  Further, when the bed leg is placed on the placing plate part, the anti-slip member is compressed between the top surface of the recess and the bed installation surface by the load from the bed leg so as to contact the floor. The surface is configured to contact the bed installation surface. Therefore, it is possible to prevent a decrease in load detection accuracy due to the influence of the anti-slip member. Furthermore, since the force for pressing the anti-slip member against the bed installation surface is reduced, even if the anti-slip member is made of rubber, the anti-slip member can be prevented from sticking to the bed installation surface. it can.

  In the invention of [17], the stability of the load detector is improved in a state where the leg portion of the bed is placed at a proper load detection position on the placement plate portion.

  In the invention of [18], when the anti-slip member is compressed, the anti-slip member is reliably accommodated in the recess. As a result, when the bed leg portion is placed on the placement plate portion, the floor contact surface of the load detector can be reliably brought into contact with the bed installation surface.

  In the invention [19], since the rubber non-slip member is generally available at a low cost, the manufacturing cost of the load detector can be reduced by using the rubber non-slip member.

  In the invention [20], the distortion of the cantilever portion can be reliably detected.

  In the invention [21], the distortion of the cantilever portion can be detected with high accuracy.

  In the invention of [22], at least one of the substrate portion, the cantilever portion and the mounting plate portion can be advantageously manufactured in terms of cost.

  In the invention of [23], at least two of the substrate part, the cantilever part, and the mounting plate part can be advantageously manufactured in terms of cost, and the connection strength between the at least two parts can be improved. it can.

  In the invention of [24], the effect of any one of the above-described [1] to [23] can be obtained, and further, it can be reliably detected whether or not the subject is on the bed.

  In the invention [25], the calculation result of the calculation means can be displayed reliably.

  In the invention of [26], it is possible to notify a nurse, a caregiver, a supervisor, etc. with an alarm when the calculation result of the calculation means is out of the set range.

  In the invention of [27], it is possible to detect at a remote place whether or not the subject is on the bed.

  In the invention [28], it is possible to reliably detect whether or not the subject is on the bed, in addition to the effects of any one of the inventions [1] to [23].

  In the invention [29], the effect of any one of the above-mentioned [1] to [23] can be obtained, and it can be reliably monitored whether or not the subject is on the bed.

It is a schematic perspective view which shows the load detector and occupancy detection apparatus of the bed which concern on 1st Embodiment of this invention in use condition. It is an enlarged view of the A part in FIG. It is a perspective view of the load detector. It is a top view of the load detector. FIG. 5 is a sectional view taken along line XX in FIG. 4. It is a disassembled perspective view of the load detector. (A) is a side view of the cantilever portion of the load detector, and (B) is a bottom view of the cantilever portion. It is a figure which shows the bridge circuit of the load detector. It is a block diagram of a coexistence floor detection apparatus. It is a flowchart figure which shows the presence detection process of the presence detection apparatus. It is a figure (graph) which shows the relationship between the time and the total value of a load for demonstrating the reference | standard setting value of bed presence determination, and the reference | standard setting value of bed leaving determination in the same floor detection apparatus. It is a perspective view of the load detector of the bed concerning a 2nd embodiment of the present invention. It is a top view of the load detector. It is the XX sectional view taken on the line in FIG. It is a disassembled perspective view of the load detector. It is a perspective view of the load detector of the bed concerning a 3rd embodiment of the present invention. It is a top view of the load detector. It is a bottom view of the load detector. It is the XX sectional view taken on the line in FIG. FIG. 20 is an enlarged view of a Z portion in FIG. 19. It is a perspective view of the load detector. It is a partially notched side view of the state before mounting the caster of a bed on the mounting plate part of a load detector. It is an enlarged view of Y part in FIG. It is a partially notched side view of the state which mounted the caster of the bed on the mounting board part of a load detector. It is an enlarged view of the Y part in FIG.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, (1) is a bed load detector according to the first embodiment of the present invention, and (20) is a bed occupancy detector according to one embodiment of the present invention. (50) is a bed.

  The bed (50) is used in a medical facility (eg, a hospital), an elderly facility, a nursing facility, a general household, and the like, and is formed in a rectangular shape in plan view. The bed (50) has a plurality of legs, specifically, a left head leg, a right head leg, and a left leg of a subject (not shown). There are a total of four leg parts, a leg part on the side and a leg part on the right leg part side. In the present embodiment, each leg of the bed (50) is formed of a rotatable bed moving caster (51) that travels on the bed installation surface (55) when the bed (50) is moved.

  On this bed (50), healthy persons, sick persons, infants, elderly people, cared persons, etc., are present as subjects in a lying position or the like for sleep or rest.

  In the present invention, the bed (50) is not limited to a sleeping or resting bed, but may be, for example, an examination table, an examination table, a stretcher, or a sofa.

  The bed presence detection device (20) is for detecting whether or not the subject is on the bed (50).

  Thus, the bed load detector (1) of the present embodiment is used in the occupancy detection device (20), and more specifically, the bed (50) on the bed installation surface (55). The four casters (51), (51), (51), and (51) are used as a plurality of legs, respectively, ie, a bed installation surface (55) and a bed (50 ) And the casters (51). The bed installation surface (55) includes a hospital room, an examination room, an examination room, a floor surface of a bedroom, and the like.

  Here, for convenience of explanation, in this embodiment, in the state where the load detector (1) is placed on the bed installation surface (55) and used, the direction along the length direction of the bed (50) The direction along the width direction of the bed (50) is referred to as the length direction of the detector (1) and its constituent members, and the width direction of the load detector (1) and its constituent members. In the present invention, it is assumed that a maximum load of 2000 N (200 kgf) is applied to one load detector (1). 3 and 4, the front-rear direction of the load detector (1) is indicated by arrows.

  As shown in FIGS. 1 to 7, the load detector (1) includes a substrate part (2), a cantilever part (7), a mounting plate part (13), and a strain gauge as a strain detection sensor. (R1) (R2) (R3) (R4).

  The substrate portion (2) is formed of an extruded material of aluminum (including an alloy thereof; the same applies hereinafter), and is placed on the bed installation surface (55).

  As shown in FIGS. 3, 4, and 6, the substrate portion (2) includes a pair of side portions (3) and (3) that are spaced apart from each other, and the side portions (3) ( 3) A pair of connecting side portions (4) and (4) that are opposed to each other and that are connected to each other at one end portion and the other end portions of both side portions (3) and (3). Thus, it is formed in a substantially rectangular shape (rough shape) in plan view. In the present embodiment, the side portions (3) and (3) are opposed to each other while being separated in the width direction of the substrate portion (2) (that is, the width direction of the bed (50)). Both the connecting side portions (4) and (4) are arranged to face each other while being separated in the length direction of the substrate portion (2) (that is, the length direction of the bed (50)).

  Moreover, in FIG. 5, (6) is a floor contact surface with the bed installation surface (55) of the board | substrate part (2) of a load detector (1). This floor contact surface (6) consists of the lower surface of the substrate portion (2).

  As shown in FIG. 5, the thickness a of the connecting side portion (4) of the substrate portion (2) is set so that the substrate portion (2) is not deformed when the caster (51) of the bed (50) is placed. It is determined in consideration of the section modulus and the like, and it is desirable that the height does not interfere with the part other than the caster (51) of the bed (50), for example, 70 mm or less (particularly desirably 40 mm or less). It is desirable to set to. However, in the present invention, a is not limited to this range.

  The cantilever portion (7) is formed of an aluminum extruded material, is a straight one having a predetermined length, and functions as an elastically bendable strain generating body. The cantilever portion (7) is slightly spaced upward from the bed placement surface (55) on the substrate portion (2) and extends in the length direction between the side portions (3) and (3). In a state, it is supported in a cantilever shape substantially horizontally. More specifically, the base end portion (ie, the fixed end portion) (7a) of the cantilever portion (7) is one of the connection sides (4) and (4) of the substrate portion (2). The base end part (7a) of the cantilever part (7) is placed on the connection side part (4) in this placement state. Cantilever part fixing bolt (17) (or screw). Further, in this fixed state, the cantilever portion (7) is horizontally disposed between the side portions (3) and (3) and supported by the connecting side portion (4).

  In FIG. 6, (8) is provided at the base end (7a) of the cantilever portion (7) and is a bolt insertion hole (or screw) corresponding to the cantilever portion fixing bolt (17) (or screw). Screw insertion hole). Moreover, (5) is a bolt insertion hole (or screw insertion hole) provided on the connecting side portion (4) and corresponding to the cantilever beam fixing bolt (17) (or screw). (19) is a screw hole plate having a screw hole (19a) corresponding to the cantilever beam fixing bolt (17). As shown in FIG. 5, the screw hole plate (19) is disposed in a recess provided on the lower surface of the connecting side portion (4).

  In the present invention, the means for fixing the cantilever portion (7) to the substrate portion (2) is not limited to the bolt (17), and other examples include screws, rivets, welding, Friction stir welding, brazing, or the like may be used.

  The mounting plate portion (13) is formed of an aluminum extruded material, and a caster (51) as a leg portion of the bed (50) is mounted on the upper surface (13a) of the mounting plate portion (13). It is what is done. The mounting plate portion (13) is attached substantially horizontally to the tip end portion (that is, free end portion) (7b) of the cantilever portion (7). More specifically, a caster fall prevention means for preventing the caster (51) (i.e., the leg portion of the bed) from dropping from the placement plate portion (13) on the base end edge portion of the placement plate portion (13). The caster drop prevention wall portion (14A) (that is, the leg drop prevention wall portion) standing upright with respect to the upper surface (13a) of the mounting plate portion (13) is provided in a fixed state (ie, the leg drop prevention means). It has been. This caster fall prevention wall (14A) functions as a stopper wall that stops the caster (51) from reaching the proper load detection position on the mounting plate (13) from the bed installation surface (55) Also have. Therefore, this caster fall prevention wall part (14A) can also be regarded as a stopper wall part.

  In addition, the left and right edges of the mounting plate (13) are provided as caster drop prevention means (ie, leg drop prevention means) on the left and right sides of the mounting plate (13) with respect to the upper surface (13a). A pair of caster fall prevention walls (14B) (14B) (that is, leg fall prevention walls) is provided in a fixed state. In the first embodiment, the caster drop prevention walls (14B) (14B) are arranged in parallel to each other. On the other hand, such a caster fall prevention wall portion is not provided at the tip edge portion of the mounting plate portion (13).

  3 and 4, (C) is a traveling direction of the caster (51) when the caster (51) is placed on the placement plate portion (13) from the bed installation surface (55).

  And in this mounting board part (13), as shown in FIG. 5, the front-end | tip surface which consists of a vertical surface of the front-end | tip part (7b) of a cantilever part (7) has this mounting board part (13). The caster drop prevention wall (14A) at the base edge is overlapped with the lower surface (13b) of the mounting plate (13) positioned slightly below the lower surface of the cantilever (7). Yes. Then, in this superposed state, a plurality of caster drop prevention wall portions (14A) are provided on the tip surface of the cantilever portion (7) (four in this embodiment) by the mounting plate portion fixing screws (18). By being fixed, the mounting plate part (13) is attached to the front end part (7b) of the cantilever part (7), and both side parts (3) (3) and both connecting side parts ( 4) It is attached substantially horizontally in a state of being slightly spaced upward with respect to the bed installation surface (55) between (4) and (4).

  As described above, the mounting plate portion (13) can be displaced downward between the side portions (3) (3) and the connecting side portions (4) (4) of the substrate portion (2). The cantilever portion (7) is supported by the connecting side portion (4).

  In FIG. 6, (15) is a screw insertion corresponding to the mounting plate portion fixing screw (18) provided on the caster drop prevention wall portion (14A) at the base end edge portion of the mounting plate portion (13). It is a hole. Further, (9) is a screw hole provided on the distal end surface of the distal end portion (7b) of the cantilever portion (7) and corresponding to the mounting plate portion fixing screw (18).

  In the present invention, the means for attaching the mounting plate portion (13) to the cantilever portion (7) is not limited to the screw (18), and other examples include bolts, rivets, It may be welding, friction stir welding, brazing, or the like.

  Further, as shown in FIG. 5, the entire upper surface (13a) of the mounting plate portion (13) is moved in the direction from the front end edge to the proximal end side of the mounting plate portion (13), that is, a caster ( 51) is formed on a slightly downward slope in the traveling direction (C) of the caster (51) when placing the bed (55) on the placement plate (13) from the bed installation surface (55). Further, the entire lower surface (13b) of the mounting plate portion (13) is formed on an inclined surface having a slight downward slope in a direction from the distal end edge to the proximal end side of the mounting plate portion (13). Therefore, in the state where the substrate part (2) is placed on the bed installation surface (55), the distance b from the bed installation surface (55) of the front edge of the lower surface (13a) of the placement plate part (13) is When the lower surface (13b) of the mounting plate portion (13) is not formed on an inclined surface, that is, when the lower surface (13b) of the mounting plate portion (13) is horizontal, it is longer. This distance b is desirably set to 1 to 10 mm or less (particularly preferably 1 to 5 mm or less). However, in the present invention, the distance b is not limited to such a range. Moreover, the distance c from the bed installation surface (55) of the base end edge part of the lower surface (13b) of the mounting plate part (13) is set in a range of 1 to 9 mm (particularly preferably 1 to 4 mm). desirable. However, in the present invention, the distance c is not limited to such a range. By doing so, it is possible to prevent the caster (51) from falling from the placement plate portion (13).

  The inclination angle (that is, the gradient) of the upper surface (13a) of the mounting plate portion (13) with respect to the horizontal plane (bed installation surface (55)) is in the range of 0.1 to 2 ° (particularly preferably 0.5 to 1 °). It is desirable to be set to. Moreover, the inclination angle (namely, gradient) with respect to the horizontal surface (bed installation surface (55)) of the lower surface (13a) of the mounting plate portion (13) is 0.1 to 2 ° (particularly preferably 0.5 to 1 °). It is desirable to be set within the range. However, in the present invention, these inclination angles are not limited to such a range.

  In the present invention, not the entire upper surface (13a) of the mounting plate portion (13), for example, only the tip of the upper surface (13) may be formed on the inclined surface. Further, instead of the entire lower surface (13b) of the mounting plate portion (13), for example, only the tip of the lower surface (13b) may be formed on the inclined surface.

  The thickness of the mounting plate portion (13) is desirably set to 3 to 20 mm or less (particularly preferably 3 to 10 mm or less). However, in the present invention, the thickness of the mounting plate portion (13) is not limited to such a range.

  Moreover, the front-end | tip edge part of a mounting board part (13) is located in the vicinity of the inner edge part of the other connection side part (4) among both connection side parts (4) (4) of a board | substrate part (2). ing.

  In the present invention, a part or the whole of the upper surface (13a) of the mounting plate portion (13) may be embossed so that the casters (51) do not slip.

  On the other hand, a slope surface (4a) for guiding the caster (51) of the bed (50) onto the placing plate portion (13) is formed on the other connecting side portion (4) of the substrate portion (2). That is, the upper surface of the other connecting side portion (4) is formed on the slope surface (4a) having an upward slope in the direction of proceeding toward the mounting plate portion (13). The caster (51) passes (runs) on the slope surface (4a) and is placed on the placing plate portion (13). It is desirable that the slope of the slope surface (4a) with respect to the bed installation surface (55) is, for example, in the range of 2 to 10 ° (particularly preferably 2 to 6 °). However, in the present invention, the gradient is not limited to this range.

  Four strain gauges (R1), (R2), (R3), and (R4) as strain detection sensors are attached to the cantilever (7), and the subject is on the bed (50). Detects the strain of the cantilever (7) that occurs, and thereby detects the load on the bed (50) when the subject is in bed and the load on the bed (50) when the subject is not on bed An electrical signal used in the above is output. This output signal is used for detection as to whether or not the subject is on the bed (50) in the calculation means (21) described later.

  On the other hand, as shown in FIG. 7, the cantilever portion (7) is provided with a hollow hole (10) having a substantially glasses-shaped cross section penetrating in the width direction. The large-diameter hole on the tip (free end) side of the cantilever part of the two large-diameter holes (10a) (10a) of the hollow hole (10) on the lower surface of the cantilever part (7) Of the four strain gauges (R1), (R2), (R3), and (R4), two strain gauges (R1) and (R3) are arranged in the width direction as tension side strain gauges at the lower position of (10a). It is attached with an adhesive. On the other hand, on the lower surface of the cantilever portion (7), the remaining two pieces are located at the lower side of the large-diameter hole portion (10a) on the base end (fixed end) side of the hollow hole (10). The strain gauges (R2) and (R4) are attached to the compression side strain gauges in the width direction and attached with an adhesive.

  These four strain gauges (R1), (R2), (R3), and (R4) are electrically connected as shown in FIG. 8 to form a Wheatstone bridge circuit (16). In the present embodiment, the output voltage as an electrical output signal from the bridge circuit (16) is used to detect whether or not the subject is on the bed (50).

  Further, in the present embodiment, distortion can be accurately detected regardless of where the caster (51) is placed on the placement plate portion (13).

  Thus, as shown in FIG. 1, the bed occupancy detection device (20) of the present embodiment includes the four load detectors (1), (1), (1), and (1), and arithmetic means ( 21), a display means (25), an alarm means (26), and a communication means (27).

  The calculation means (21) calculates whether or not the subject is present on the bed (50) based on the output signal from the strain detection sensor of the load detector (1), and includes a CPU, ROM And a computer having a RAM and other memories. In the present embodiment, the output voltage from the bridge circuit (16) is used as an output signal from the strain detection sensor of the load detector (1).

  The display means (25) displays the calculation result of the calculation means (21), and includes a CRT, a liquid crystal display, and the like.

  The alarm means (26) issues an alarm based on the calculation result of the calculation means (21), and includes a speaker, a lamp, and the like.

  The communication means (27) transmits the calculation result of the calculation means (21).

  In the calculation means (21), as shown in FIG. 9, the output voltage as the output signal from the bridge circuit (16) (16) (16) (16) of each load detector (1) is converted into the amplification section (22). After being amplified in, it is converted into a digital signal in an A / D converter (analog / digital converter) (23). Then, this signal is transmitted to a central processing unit (24) such as a computer. The central processing unit (24) calculates whether or not the subject is on the bed (50) according to a predetermined program based on the transmitted digital signal.

  In the present invention, the central processing unit (24) of the calculating means (21) further calculates the position of the center of gravity of the subject on the bed (50) (that is, the subject's bed position), ) May be calculated in advance to predict the fall from.

  In the display means (25), information relating to whether or not the subject is present on the bed (50) is displayed in real time on a display such as a predetermined monitor TV as a calculation result by the calculation means (21).

  In the communication means (27), information on whether or not the subject is present on the bed (50) as a calculation result by the calculation means (21) is a predetermined value such as a telephone line network, the Internet, a wired LAN, and a wireless LAN. Is transmitted to a monitoring room such as a nursing center or a mobile phone (including PHS) as a remote location via a wired communication network or a wireless communication network.

  In the alarm means (26), if the information regarding whether or not the subject is on the bed (50) is out of the setting range as the calculation result by the calculation means (21), for example, on the bed (50) When a subject who is in bed leaves the bed, an alarm is issued to nurses, caregivers, monitors, and the like.

  Next, the bed detection method performed using the load detector (1) and the bed detection device (20) will be described below.

  First, as shown in FIG. 1, load detectors (51) (51) (51) (51) on the bed installation surface (55) are respectively positioned at positions corresponding to the four casters (51) (51) (51) (51). 1) is placed. Next, each caster (51) of the bed (50) is placed on the placement plate portion (13) of the corresponding load detector (1) from the bed installation surface (55). At this time, the caster (51) is caused to pass (run) on the slope surface (4a) of the connecting side portion (4) of the substrate portion (2) of the load detector (1), whereby the caster (51) Can be easily mounted on the mounting plate portion (13).

  Next, the subject is on the bed (50) and becomes a lying posture. Thus, when the subject is on the bed (50), the placement plate (13) of each load detector (1) receives the load of the bed (50) via the corresponding caster (51). While being displaced downward between the side portions (3) and (3) of the substrate portion (2) and the connecting side portions (4) and (4), the cantilever portion (7) is elastically moved downward. Slightly bent and distorted. This strain is detected by a bridge circuit (16) formed by incorporating four strain gauges (R1) (R2) (R3) (R4) as strain detection sensors. And the output voltage as an electrical output signal from each bridge circuit (16) is transmitted to the calculating means (21) via the signal line (28). Based on the transmitted output voltage, it is calculated by the calculating means (21) whether or not the subject is on the bed (50).

  The calculation result of the calculation means (21), that is, information on whether or not the subject is present on the bed (50) is displayed by the display means (25) and at the predetermined remote location by the communication means (27). And sent to mobile phones. Moreover, when the subject who was present on the bed (50) gets out of bed, an alarm is issued by the alarm means (26).

  Next, processing executed by the central processing unit (24) of the computing means (21) will be described below with reference to FIG.

  In step S1, the output voltage from the bridge circuits (16) (16) (16) (16) of the four load detectors (1) (1) (1) (1) is normal immediately after the start of operation. A determination is made about whether or not. If it is determined to be normal, the process proceeds to step S3 as “Yes”. On the other hand, if it is determined that there is an abnormality, the process proceeds to step S2 as “No”, and an abnormality occurrence alarm is issued by the alarm means (26).

  In step S3, the total load value W is calculated based on the output voltage from each bridge circuit (16) (16) (16) (16). Next, the process proceeds to step S4. The total load value W is derived from the following equation (i).

W = W1 + W2 + W3 + W4 (i)
In the above equation (i), W1 to W4 are loads corresponding to the output voltages from the bridge circuits (16), (16), (16), and (16), respectively, and are derived from the following equations. That is, W1 = A1 * V1 + B1, W2 = A2 * V2 + B2, W3 = A3 * V3 + B3, and W4 = A4 * V4 + B4. V1 to V4 are output voltages from the bridge circuits (16), (16), (16), and (16), respectively. A1 to A4 and B1 to B4 are values determined in advance.

  In step S4, the tare process is performed in a state where the subject is not on the bed (50), and the load (weight) of only the subject is measured. Next, the process proceeds to step S5.

  In step S5, the total load value W is greater than or equal to a reference set value WU for determining that the subject is present on the bed (50) (this is referred to as a “standard setting value WU for presence determination”). A determination is made as to whether or not there is. That is, as shown in FIG. 11, when it is determined that the total load value W is equal to or greater than the reference setting value WU for occupancy determination (that is, W ≧ WU), the process proceeds to S7 as “Yes”. It is determined that the medium is present, and predetermined occupancy information is displayed by the display means (25). On the other hand, when it is determined that the total load value W is less than the reference set value WU for occupancy determination (ie, W <WU), the process proceeds to step S6 as “No”, and is determined to be absent, and step S4 is performed. Return to. In addition, the reference set value WU for occupancy determination is preset and stored in a storage unit (not shown) provided in the calculation means (21).

  In step S8, the total load value W is set as a reference set value WD for determining that the subject lying on the bed (50) has left the bed (50) (this is referred to as the “standard set value WD for getting out of bed”). It is determined whether or not it is the following. That is, as shown in FIG. 11, when it is determined that the total load value W is equal to or less than the reference setting value WD for getting out of bed (that is, W ≦ WD), the process proceeds to step S9 as “Yes”, The determination returns to step S4, and at the same time, the process proceeds to step S10, where a warning alarm is issued by the alarm means (26). Based on this warning, it is possible to know the accidental fall from the subject's wakeup or the subject's bed (50). On the other hand, if it is determined that the total load value W exceeds the reference setting value WD for getting out of bed (that is, W> WD), “No” is returned to Step S7. The reference set value WD for getting out of bed is set and stored in advance in a storage unit provided in the calculation means (21).

  Thus, the bed load detector (1) of the first embodiment has the following advantages.

That is, the load detector (1) is provided with a mounting plate (13) at the tip (7b) of the cantilever (7) supported horizontally by the substrate (2), and is cantilevered. Since the strain gauges (R1 to R4) as strain detection sensors are attached to the beam portion (7), the structure of the load detector (1) can be simplified, and thus the load detector (1) The height from the bed installation surface (55) of the mounting plate (13) can be kept low. Therefore, when the caster (51) of the bed (50) is placed on the placement plate (13) of the load detector (1), the bed (50) can be lowered. Therefore, the caster (51) of the bed (50) can be easily placed on the placement plate portion (13) of the load detector (1), and the caster ( 51) can be taken down easily.

  Further, the mounting plate portion (13) of the load detector (1) is between the side portions (3) (3) and the connecting side portions (4) (4) of the substrate portion (2) in plan view. And can be displaced downward between the side edges (3) (3) and the connecting edges (4) (4). The substrate part (2) does not exist, and therefore the height of the mounting plate part (13) can be set further lower.

  Furthermore, since the one end parts and the other end parts of both side parts (3) (3) of the board part (2) are connected to each other by a pair of connecting side parts (4) (4), the board The stability of part (2) is high. Therefore, the placement plate portion (13) is accurately displaced downward.

  Moreover, the slope surface (4a) which guides a caster (51) on a mounting plate part (13) to a predetermined connection side part (4) of both connection side parts (4) and (4) of the substrate part (2). ) Is formed, when the caster (51) is placed on the placement plate (13), the caster (51) is passed over the slope surface (4a) of the connecting side (4). Thereby, a caster (51) can be easily mounted on a mounting board part (13). Further, when the caster (51) is lowered from the placing plate (13), the caster (51) is passed by passing the caster (51) over the slope surface (4a) of the connecting side (4). It can be easily lowered from the mounting plate (13).

  Moreover, since the caster fall prevention wall part (14A) (14B) (14B) is provided in the base end edge part and both side edge part of the mounting plate part (13), respectively as a caster fall prevention means, It is possible to reliably prevent the caster (51) from falling from the placement plate portion (13).

  Further, since the upper surface (13a) of the mounting plate portion (13) is formed on a slope having a downward slope in the direction from the front edge to the proximal end side of the mounting plate portion (13), Since the caster (51) placed on the plate part (13) moves to the base end side of the placement plate part (13) by itself, the placement plate part (13) of the caster (51) Can be prevented from falling from the front edge.

  Further, since the lower surface (13b) of the mounting plate portion (13) is formed on a slope having a downward slope in the direction from the distal end edge to the proximal end side of the mounting plate portion (13), The distance b from the bed installation surface (55) of the front edge of the plate portion (13) can be increased. For this reason, it is possible to prevent the tip edge portion of the placement plate portion (13) from coming into contact with the bed installation surface (55) as much as possible by lowering the placement plate portion (13).

  In addition, since strain gauges (R1), (R2), (R3), and (R4) are mounted at predetermined positions on the cantilever part (7) as strain detection sensors, the distortion of the cantilever part (7) is ensured. Can be detected.

  In addition, the output voltage from the bridge circuit (16) incorporating the four strain gauges (R1), (R2), (R3), and (R4) is used to detect the load on the bed (50). The distortion of the cantilever portion (7) can be detected with high accuracy.

  Moreover, since all of the substrate part (2), the cantilever part (7), and the mounting plate part (13) are formed of the extruded material, they can be manufactured advantageously in terms of cost.

  The bed presence detection device (20) of the present embodiment has the following advantages.

  That is, since the occupancy detection device (20) includes the load detector (1), the occupancy detection device (20) has the advantages of the load detector (1), and further includes an arithmetic unit (21) and a display device (25). ), An alarm device (26), and a communication device (27), it is possible to reliably detect whether or not the subject is present on the bed (50), and the computing means (21) If the calculation result of the calculation means (21) is out of the setting range, for example, the subject leaves the bed or the subject accidentally drops from the bed (50) In addition, it is possible to notify a nurse, a caregiver, a supervisor, or the like with an alarm, and it is possible to detect at a remote place whether or not the subject is on the bed (50).

  The bed occupancy detection system according to the first embodiment of the present invention includes a load detector (1), a calculation means (21), a display means (25), an alarm means ( 26) and communication means (27). Therefore, according to this monitoring system, in addition to having the above advantages of the bed detection device (20), it is possible to reliably monitor whether or not the subject is on the bed (50) in a remote place or the like. Can do.

  12-15 is a figure explaining the load detector of the bed which concerns on 2nd Embodiment of this invention. In these drawings, the same reference numerals are given to the same elements as those of the load detector (1) of the first embodiment.

In this load detector (1), the cantilever portion (7) and the mounting plate portion (13) are integrally formed by aluminum die casting.

  Other configurations of the load detector (1) are the same as those in the first embodiment.

  According to this load detector (1), since the cantilever portion (7) and the mounting plate portion (13) are integrally formed by aluminum die casting, the cantilever portion (7) and the mounting plate portion are formed. (13) can be advantageously manufactured in terms of cost, and the connection strength between the two can be greatly improved. Of course, there is an advantage that it is not necessary to use a connecting member such as a screw for connecting the two.

  FIGS. 16-25 is a figure explaining the load detector of the bed which concerns on 3rd Embodiment of this invention. In these drawings, the same reference numerals are given to the same elements as those of the load detector (1) of the first embodiment.

  In this load detector (1), the cantilever portion (7) and the placing plate portion (13) are integrally formed by aluminum die casting. Moreover, the leg part of the bed (50) mounted on the mounting plate part (13) includes a bed moving caster (51).

  In FIG. 16, (S) is a normal load detection position (specifically, a normal load detection region) on the upper surface (13a) of the mounting plate portion (13) in the load detector (1). Further, (C) shows the traveling of the caster (51) when the caster (51) is placed on the placing plate portion (13) from the bed installation surface (55) as described in the first embodiment. The direction is shown (refer FIG.22 and FIG.24).

  On the base edge of the mounting plate (13), the caster (51) travels from the bed installation surface (55) to the normal load detection position (S) on the mounting plate (13). A rising stopper wall (14A) is integrally formed with the upper surface (13a) of the mounting plate (13) to be stopped. This stopper wall part (14A) also has a function as a caster fall prevention wall part (that is, a leg part fall prevention wall part) that prevents the caster (51) from dropping from the placement plate part (13). . Therefore, this stopper wall part (14A) can also be regarded as a caster fall prevention wall part (leg part fall prevention wall part). The cross-sectional shape of the stopper wall (14a) is substantially arcuate as shown in FIG.

  In addition, on both side edges of the mounting plate portion (13), a pair of rising shapes with respect to the upper surface (13a) of the mounting plate portion (13) is provided as caster dropping prevention means (ie, leg portion falling prevention means). The caster fall prevention walls (14B) and (14B) (that is, the leg fall prevention walls) are integrally formed. In the third embodiment, as shown in FIG. 17, the distance between the caster drop prevention walls (14B) and (14B) gradually increases in the direction opposite to the traveling direction (C) of the casters (51). In other words, it is integrally formed on both side edges of the mounting plate portion (13) so that the distance between the two in the traveling direction (C) of the caster (51) becomes gradually narrower. The distance between the rear ends of both caster drop prevention walls (14B) and (14B) is set, for example, in the range of 70 to 100 mm, and the distance between the front ends of both caster fall prevention walls (14B) and (14B) is For example, it is set in the range of 120 to 200 mm. However, in the present invention, the distance between the front end portions and the distance between the rear end portions of the caster drop prevention wall portions (14B) (14B) is not limited to the above range.

  In addition, as shown in FIG. 16, a protruding strip portion (31) on which the caster (51) can get over is integrated along the leading end edge portion at the leading end edge portion of the upper surface (13a) of the mounting plate portion (13). It is extended to. The cross-sectional shape of the ridge (31) is a mountain shape (triangular shape) or an inverted V shape as shown in FIG. When the caster (51) gets over the ridge (31), the caster (51) is placed at the regular load detection position (S) on the placement plate (13). ing.

  The protruding height of the ridge portion (31) with respect to the upper surface (13a) of the mounting plate portion (13) is set in a range of 2 to 6 mm, for example. Further, as shown in FIG. 20, the front surface (31a) of the ridge portion (31) is formed on a slope having an upward slope larger than the slope surface (4a) in the traveling direction (C) of the caster (51). Yes. Moreover, it is desirable that the gradient of the front surface (15a) of the ridge (31) with respect to the bed installation surface (55) is set in a range of 10 to 20 °. In addition, as described above, the slope of the slope surface (4a) with respect to the bed installation surface (55) is desirably in the range of, for example, 2 to 10 ° (particularly preferably 2 to 6 °). Furthermore, the height position of the upper end portion of the slope surface (4a) is set to be the same as or substantially the same as the height position of the tip edge portion of the mounting plate portion (13). However, in this invention, the protrusion height of a protruding item | line part (31) and the gradient of the front surface (31a) of a protruding item | line part (31) are not limited to said range.

  This ridge (31) further plays a role of a beam for suppressing the bending of the mounting plate (13), thereby improving the load detection accuracy, It is possible to reduce the thickness of the mounting plate (13), and thus the load detector (1) can be reduced in weight.

  Moreover, as shown in FIG.16 and FIG.17, as shown to FIG.16 and FIG.17, a caster (51) is provided from the bed installation surface (55) on the both-sides edge part of the connection side part (4) of a board | substrate part (2). A pair of rising guide walls (32), (32) is provided with respect to the slope surface (4a) for guiding in the direction toward the mounting plate (13). In the third embodiment, the guide walls (32) and (32) are in a state in which the distance between the guide walls (32) and (32) gradually decreases in the traveling direction (C) of the casters (51), in other words, the traveling direction of the casters (C). It is integrally formed on the slope surface (4a) so that the distance between them gradually increases in the direction opposite to (C). Furthermore, the rear end portions of both guide wall portions (32) and (32) are arranged at positions corresponding to the front end portions of both caster drop prevention wall portions (14B) and (14B). (32) and (32), as shown in FIG. 17, along a virtual line (detailed virtual line in detail) extending forward along the caster drop prevention walls (14B) and (14B) in plan view. Has been placed.

  The four strain gauges (R1), (R2), (R3), and (R4) as strain detection sensors are attached to the upper surface of the cantilever (7) above the hollow hole (10) with an adhesive. It is pasted and attached. These four strain gauges (R1) (R2) (R3) (R4) are electrically connected as shown in FIG. 8 to form a Wheatstone bridge circuit (16).

  Furthermore, the load detector (1) of this 3rd Embodiment is provided with the control board (35) carrying a control part etc. This control board (35) has input signal lines (more specifically, input voltage lines) and output signal lines (details) of the bridge circuit (16) in which strain gauges (R1), (R2), (R3), and (R4) are incorporated. In other words, the output voltage line (39) is electrically connected.

  In FIG. 21, (33) and (34) are nuts and washers screwed to the cantilever beam fixing bolt (17). Further, in FIG. 18, (33a) is a recessed portion that accommodates the nut (33) provided on the lower surface of the connecting side portion (4) of the substrate portion (2). Further, (36) is a recess provided on the lower surface of the substrate part (2) for reducing the weight of the load detector (1).

  Moreover, as shown in FIG.18, FIG22 and FIG.23, the mounting board part (13 in a floor contact surface (6) with the bed installation surface (55) of the board | substrate part (2) of a load detector (1). ) The three positions surrounding the position (S1) immediately below the upper normal load detection position (S) (see FIG. 18) are each provided with an oval-shaped recess (40) in bottom view.

  Further, in each of the recesses (40), an elastic non-slip member (45) made of a rubber sheet piece protrudes below the floor contact surface (6) as shown in FIG. Is arranged. In the third embodiment, the anti-slip member (45) is disposed in the recess (40) by being adhered to the top surface (40a) of the recess (40) with an adhesive or the like. This anti-slip member (45) is for preventing the load detector (1) from inadvertently sliding on the bed installation surface (55). The anti-slip member (45) is made of rubber such as natural rubber or silicone rubber.

  And this load detector (1), as shown in FIG.22 and FIG.23, under the state mounted on the bed installation surface (55), the bed detector on the mounting plate part (13). When the caster (51) is not placed, the floor contact surface (6) is supported by the anti-slip member (45) so that the floor contact surface (6) is located above the bed installation surface (55). It is configured to be slightly separated. In this state, the clearance between the floor contact surface (6) and the bed installation surface (55) is preferably set in the range of 0.2 to 2 mm. However, in the present invention, the gap is not limited to the above range.

  Further, as shown in FIGS. 24 and 25, the load detector (1) is placed on the placing plate portion (13) under the state of being placed on the bed installation surface (55). When the caster (51) is placed, the anti-slip member (45) is placed between the top surface (40a) of the recess (40) and the bed installation surface (55) due to the load from the bed caster (51). And the floor contact surface (6) is in contact with (in detail, pressure contact) the bed installation surface (55).

  The size of the anti-slip member (45) is, for example, 10 to 40 mm in length (28 mm in detail), 5 to 30 mm in width (8 mm in detail), and 0.5 to 6 mm in thickness (2 mm in detail). Etc.) is desirable.

  The size of the recess (40) is, for example, a length of 12 to 42 mm (more specifically, 30 mm), a width of 7 to 32 mm (more specifically, 10 mm), and a depth of 0.3 to 4 mm (more specifically, 1.8 mm). Etc.) is desirable.

  Furthermore, as shown in FIG. 25, the size of the recess (40) is such that the anti-slip member (45) is compressed between the top surface (40a) of the recess (40) and the bed installation surface (55). Is set to a size that can accommodate the entire anti-slip member (45).

  However, in the present invention, the size of the anti-slip member (45) and the size of the recess (40) are not limited to the above ranges.

  In the present invention, the number of recesses (40) is not limited to three. For example, in the floor contact surface (6), the recessed portions (40) are respectively provided at four places or five places surrounding the position (S1) immediately below the normal load detection position (S) on the placing plate portion (13). The anti-slip member (6) may be disposed in each recess (40).

  Next, how to use the load detector (1) of the third embodiment will be described below.

  First, as shown in FIG. 22, it mounts on the bed installation surface (55) with the space | interval corresponding to the pitch of the caster (51) as a leg part of a bed.

  Then, as shown in FIG. 23, each load detector (1) has the floor contact surface (6) supported by three anti-slip members (45) (45) (45) and the bed installation surface (55). Is slightly spaced above. Accordingly, in this state, the load detector (1) has only three anti-slip members (45) (45) (45) in contact with the bed installation surface (55), that is, three anti-slip members. The load detector (1) is supported only by the members (45) (45) (45).

  Next, a bed moving worker (that is, a bed installing worker) (not shown) pushes the bed, so that each caster (51) of the bed is moved from the bed installation surface (55) to the corresponding load detector (1). It is made to drive | work on a slope surface (4a) toward the mounting plate part (13) of this, and also gets over a protruding item | line part (31).

  When the caster (51) gets over the ridge (31), the caster (51) is placed at the regular load detection position (S) on the placement plate (13) as shown in FIG. In addition, the caster (51) is casted by the force generated by getting over the ridge (31) and the action of gravity due to the inclination of the upper surface (13a) of the mounting plate (13). (51) travels slightly on the mounting plate (13) toward the stopper wall (14A) and abuts against the stopper wall (14A). As a result, the caster (51) stops traveling, so that the caster (51) is in contact (abutting) with the stopper wall (14A), and the normal load detection position on the mounting plate (13) ( S).

  In this state, as shown in FIG. 25, the load detector (1) is configured such that the anti-slip member (45) is placed on the top surface (40a) of the recess (40) and the bed installation surface by the load from the bed caster (51) As a result of being compressed downward with respect to (55) and reducing its thickness, the floor contact surface (6) is disposed in contact with (in detail, pressure contact) the bed installation surface (55). At this time, as described above, the entire anti-slip member (45) is accommodated in the recess (40) in a compressed state.

  By the above procedure, the bed casters (51) are placed on the placement plate (13) of the load detector (1). The operation of lowering the bed caster (51) from the placement plate portion (13) of the load detector (1) onto the bed installation surface (55) is performed by a procedure reverse to the procedure described above.

  The bed occupancy detection method using the load detector (1) is the same as in the first embodiment, and a description thereof is omitted.

  Thus, the load detector (1) of the third embodiment has the same advantages as the load detector of the first embodiment, and further has the following advantages.

  In this load detector (1), a pair of caster fall prevention walls (14B) (14B) are opposite to the traveling direction (C) of the casters (51) at both side edges of the mounting plate (13). It is provided in a state where the distance between the two becomes wider in the direction. Therefore, when the caster (51) is placed on the placement plate portion (13) from the bed installation surface (55), the caster (51) can be prevented from dropping from the placement plate portion (13). Furthermore, the caster (51) can be easily put between the caster drop prevention wall parts (14B) (14B) on the placing plate part (13), so that the placing work of the caster (51) can be performed. It can be done easily. In addition, even if the caster (51) is in contact with the caster drop prevention wall (14B) during the placement operation of the caster (51) on the placement plate (13), the stopper The caster (51) can be guided along the caster fall prevention wall (14B) in the direction toward the wall (14A).

  Furthermore, a stopper wall (14A) that stops the caster (51) from reaching the normal load detection position (S) on the mounting plate (13) at the base edge of the mounting plate (13). Therefore, the caster (51) can be reliably placed at the regular load detection position (S) on the placement plate (13). Therefore, it is possible to prevent a decrease in load detection accuracy due to the caster (51) being placed at a position shifted from the regular load detection position (S) on the placement plate portion (13).

  Further, a pair of guide wall portions (32) and (32) are provided on both side edges of the slope surface (4a) of the connecting side portion (4) of the substrate portion (2) in the traveling direction (C) of the caster (51). It is provided in a state where the distance between the two becomes narrow. Therefore, when the caster (51) travels on the slope surface (4a), even if the caster (51) comes into contact with the guide wall (32), the caster (51) Since (32) is guided in the direction toward the placement plate portion (13), the placement work of the casters (51) can be performed more easily.

  Furthermore, a protruding strip (31) is provided along the leading edge on the leading edge of the upper surface of the mounting plate (13), and the caster (51) climbs over the protruding strip (31). The caster (51) is configured to be placed at the regular load detection position (S) on the placement plate portion (13). Therefore, the caster (51) can be reliably placed at the regular load detection position (S) on the placement plate portion (13). Furthermore, about the caster (51) mounted on the mounting board part (13), accidental fall from the front-end | tip edge part of a mounting board part (13) can be prevented by this convex part (31).

  Furthermore, since this ridge part (31) also plays the role of the beam for suppressing the bending of the mounting plate part (13), it is possible to improve the detection accuracy, and further, the mounting plate part It becomes possible to reduce the thickness of (13).

  Further, the front surface (31a) of the ridge portion (31) is formed on an inclined surface having an upward slope larger than the slope of the slope surface (4a) in the traveling direction (C) of the caster (51). Therefore, whether or not the caster (51) has climbed over the ridge (31) from above the slope surface (4a), that is, the caster (51) is the normal load detection position (S) on the mounting plate (13). The bed moving operator can easily determine whether or not it is placed on the basis of the magnitude of the force when pushing the bed.

  Further, the load detector (1) is not mounted on the bed caster (51) on the mounting plate (13) under the condition of being mounted on the bed installation surface (55). In this case, the floor contact surface (6) is supported by the anti-slip member (45), and the floor contact surface (6) is separated upward from the bed installation surface (55). Therefore, when the bed caster (51) is placed on the placement plate (13), the slip detector (45) can prevent the load detector (1) from slipping on the bed installation surface (55). . For this reason, it is possible to more easily carry the caster (51).

  Further, when the bed caster (51) is placed on the placement plate (13), the load detector (1) is provided with a non-slip member (45) by the load from the bed caster (51). ) Is compressed between the top surface (40a) of the recess (40) and the bed installation surface (55) so that the floor contact surface (6) contacts the bed installation surface (55). Therefore, it is possible to prevent a decrease in load detection accuracy due to the influence of the anti-slip member (45). Further, since the force for pressing the anti-slip member (45) against the bed installation surface (55) is reduced, even if the anti-slip member (45) is made of rubber, the anti-slip member (45) Sticking to the bed installation surface (55) can be suppressed. Therefore, when the load detector (1) becomes unnecessary, the load detector (1) can be easily removed from the bed installation surface (55).

  Further, in the floor contact surface (6) of the load detector (1), the recesses (40) are respectively provided at three locations surrounding the position immediately below the normal load detection position (S) on the mounting plate portion (13). The anti-slip member (45) is disposed in each recess (40). Therefore, the stability of the load detector (1) is improved in a state where the bed casters (51) are placed at the regular load detection position (S) on the placement plate (13).

  Furthermore, the size of the recess (40) is such that the anti-slip member (45) is compressed in a state where the anti-slip member (45) is compressed between the top surface (40a) of the recess (40) and the bed installation surface (55). It is set to a size that can accommodate the whole. Therefore, when the anti-slip member (45) is compressed, the anti-slip member (45) is reliably accommodated in the recess (40). As a result, when the bed caster (51) is placed on the placement plate (13), the floor contact surface (6) can be reliably brought into contact with the bed installation surface (55).

  Furthermore, since the non-slip member (6) is made of rubber, it can be obtained at a low cost. Therefore, the manufacturing cost of the load detector (1) can be reduced.

  As mentioned above, although several embodiment of this invention was described, this invention is not limited to what was shown to the said embodiment, A setting change is variously possible.

  For example, in the above embodiment, the substrate portion (2) of the load detector (1) has a substantially rectangular shape in plan view. However, in the present invention, the substrate portions (2) are spaced apart from each other. A connecting side that is disposed between the pair of side sides (3) and (3) and both side portions (3) and (3) and that connects one end portions of the side sides (3) and (3) to each other. It may have a portion (4) and be formed in a substantially U shape (including a U shape) in plan view.

  In the present invention, the material of the substrate part (2), the cantilever part (7) and the mounting plate part (13) may be a metal other than aluminum (for example, stainless steel), fiber reinforced plastic, etc. It may be plastic.

  In the present invention, the cantilever portion (7) and the mounting plate portion (13) may be integrally formed by aluminum die casting, or the substrate portion (2) and the cantilever portion (7) are mounted. The plate portion (13) may be integrally formed by aluminum die casting.

  Further, in the present invention, the means for attaching the strain gauges (R1 to R4) to the cantilever portion (7) is not limited to adhesion by an adhesive, but in addition, caulking, screwing, riveting, Welding (eg, spot welding), brazing, or the like may be used.

  In the present invention, one strain gauge may be attached to the cantilever portion (7) as a strain detection sensor, and two or more strain gauges may be attached to the cantilever portion (7). May be. In the present embodiment, the bridge circuit (16) is formed by incorporating four strain gauges (R1), (R2), (R3), and (R4). It may be formed by incorporating one or more strain gauges, or may be formed by incorporating one or more strain gauges and one or more fixed resistors (dummy resistors). good.

  In the present invention, the strain detection sensor may be a sensor other than a strain gauge, for example, a conductive elastomer sensor (such as a conductive rubber sensor or a conductive resin sensor), an electrostrictive device sensor, a piezoelectric device sensor, or a magnetostrictive device sensor. In addition, one or two or more types of sensors selected from the group consisting of these sensors may be used.

  In the present invention, the bed moving caster may not be provided on the leg of the bed (50).

  INDUSTRIAL APPLICABILITY The present invention can be used for a bed load detector, a bed presence detection device for detecting whether or not a subject is present on the bed, a bed presence detection method, and a bed presence monitoring system. .

DESCRIPTION OF SYMBOLS 1 ... Load detector 2 ... Board | substrate part 3 ... Side part 4 ... Connection side part
4a ... slope surface 6 ... floor contact surface 7 ... cantilever
7a… Base end
7b ... Tip
13… Mounting plate
13a… Top surface
13b… Bottom surface
14A ... Caster fall prevention wall (leg fall prevention wall, stopper wall)
14B ... Caster fall prevention wall
16 ... Bridge circuit
R1 ~ R4 ... Strain gauge (Strain detection sensor)
20 ... In-bed detector
21 ... Calculation means
25 ... Display means
26 ... Alarm means
27 ... Communication means
28 ... Signal line
31 ... Projection
31a… Front
32 ... Guide wall
40 ... recess
40a ... top
45 ... Anti-slip material
50 ... Bed
51 ... Caster (leg)
55 ... Bed installation surface S ... Regular load detection position

Claims (1)

A substrate part placed on the bed installation surface;
A mounting plate portion on which the leg portion of the bed is mounted, provided at a tip portion of a cantilever portion supported substantially horizontally in a state of being spaced upward from the bed installation surface on the substrate portion;
A strain detection sensor that detects a strain of the cantilever portion and outputs a signal used to detect a load of the bed;
A bed load detector comprising:
Based on the output signal from the strain detection sensor of the load detector, calculating means for calculating whether the subject is on the bed,
Display means for displaying a calculation result of the calculation means;
Alarm means for issuing an alarm based on the calculation result of the calculation means;
Communication means for transmitting a calculation result of the calculation means;
A bed occupancy monitoring system characterized by comprising:

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